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    <!-- 
        1. 先检测 脚手架是否安装成功
            vue -V
        2. 安装vue的脚手架项目
            1. vue create 项目名(必须英文)
            2. 
                Vue CLI v5.0.8
                ? Please pick a preset: (Use arrow keys) 选择安装的配置版本
                > Default ([Vue 3] babel, eslint)  vue 3 + babel + 变态的语法检查(es list)
                Default ([Vue 2] babel, eslint)    vue 2 + babel + 变态的语法检查(es list)
                Manually select features           自定义配置(选择这个)
            3. 
                 Check the features needed for your project: (Press <space> to select, <a> to
                    toggle all, <i> to invert selection, and <enter> to proceed)
                     选择vue项目的配置依赖
                    >(*) Babel 
                    ( ) TypeScript    安装ts依赖
                    ( ) Progressive Web App (PWA) Support 
                    ( ) Router (vue路由)  4
                    ( ) Vuex   (vue状态管理) 5 
                    ( ) CSS Pre-processors  (css预处理器) 6
                    (*) Linter / Formatter  (代码检查工具)
                    ( ) Unit Testing        (测试环境)
                    ( ) E2E Testing         (同上，测试版本不一样)

                    按下 1 2 3 4 5 6 7 8 9 键选择
                    选择 4 5 6 
            4. 
                 Choose a version of Vue.js that you want to start the project with (Use arrow
                keys) 选择要配置的vue版本
                > 3.x  3.0 
                2.x   2.0 (选择)
            5. 
                  Use history mode for router? (Requires proper server setup for index fallback
in production) (Y/n)  是否使用router的 history 模式  (N)
            6.
                Pick a CSS pre-processor (PostCSS, Autoprefixer and CSS Modules are supported
            by default): (Use arrow keys) 选择css的预处理工具
            > Sass/SCSS (with dart-sass)
            Less
            Stylus
            7.
                Where do you prefer placing config for Babel, ESLint, etc.?在什么地方 配置 eslint代码检查工具
                    > In dedicated config files   专门的配置文件(选择)
                    In package.json 公用的
            8. 
                Save this as a preset for future projects?项目预配置 (y/N)  N

        cd demo 进入demo文件夹下

        npm run serve 运行vue开发环境项目
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